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.. _release-8-10-7:
Release notes for version 8.10.7
================================
The significant changes to the various parts of the compiler are listed in the
following sections.
The :ghc-flag:`LLVM backend <-fllvm>` of this release is to be used with LLVM versions 9
through 12.
Portability fixes
-----------------
- Actually fix a linking portability issue on macOS that resulted in undefined
symbol errors for ``___darwin_check_fd_set_overflow`` (:ghc-ticket:`19950`),
working around a bug in certain versions of XCode 11.
We claimed to have fixed this in GHC 8.10.6, but alas this wasn't the case. The
fix was originally tested on the master branch, which uses a different build
configuration from the 8.10 branch. We have now tested the fix on the GHC 8.10
branch and finally squashed the bug.
Known issues
------------
- A long-standing bug (:ghc-ticket:`16893`) which can cause some applications
of ``unsafeCoerce`` to segmentation fault is only partially fixed in this
release. This release only avoids this issue in the uses of ``unsafeCoerce``
in ``Data.Typeable.Internal``, which was the proximate cause of
:ghc-ticket:`16893`.
However, it is possible that this bug could manifest in user-code using
``unsafeCoerce`` to perform dynamic type checks. See the :ghc-ticket:`ticket
<16893>` for details.
We expect that this issue will be fixed in the next major release of GHC.
- A long-standing bug (:ghc-ticket:`17760`) where some uses of the ``touch#``
primop can be dropped by the simplifier is present in this release. This bug
will be fixed in GHC 9.0.1. In the meantime, see the :ghc-ticket:`ticket
<17760>` for mitigations.
Included libraries
------------------
The package database provided with this distribution also contains a number of
packages other than GHC itself. See the changelogs provided with these packages
for further change information.
.. ghc-package-list::
libraries/array/array.cabal: Dependency of ``ghc`` library
libraries/base/base.cabal: Core library
libraries/binary/binary.cabal: Dependency of ``ghc`` library
libraries/bytestring/bytestring.cabal: Dependency of ``ghc`` library
libraries/Cabal/Cabal/Cabal.cabal: Dependency of ``ghc-pkg`` utility
libraries/containers/containers/containers.cabal: Dependency of ``ghc`` library
libraries/deepseq/deepseq.cabal: Dependency of ``ghc`` library
libraries/directory/directory.cabal: Dependency of ``ghc`` library
libraries/exceptions/exceptions.cabal: Dependency of ``haskeline`` library
libraries/filepath/filepath.cabal: Dependency of ``ghc`` library
compiler/ghc.cabal: The compiler itself
libraries/ghci/ghci.cabal: The REPL interface
libraries/ghc-boot/ghc-boot.cabal: Internal compiler library
libraries/ghc-boot-th/ghc-boot-th.cabal: Internal compiler library
libraries/ghc-compact/ghc-compact.cabal: Core library
libraries/ghc-heap/ghc-heap.cabal: GHC heap-walking library
libraries/ghc-prim/ghc-prim.cabal: Core library
libraries/haskeline/haskeline.cabal: Dependency of ``ghci`` executable
libraries/hpc/hpc.cabal: Dependency of ``hpc`` executable
libraries/integer-gmp/integer-gmp.cabal: Core library
libraries/libiserv/libiserv.cabal: Internal compiler library
libraries/mtl/mtl.cabal: Dependency of ``Cabal`` library
libraries/parsec/parsec.cabal: Dependency of ``Cabal`` library
libraries/pretty/pretty.cabal: Dependency of ``ghc`` library
libraries/process/process.cabal: Dependency of ``ghc`` library
libraries/stm/stm.cabal: Dependency of ``haskeline`` library
libraries/template-haskell/template-haskell.cabal: Core library
libraries/terminfo/terminfo.cabal: Dependency of ``haskeline`` library
libraries/text/text.cabal: Dependency of ``Cabal`` library
libraries/time/time.cabal: Dependency of ``ghc`` library
libraries/transformers/transformers.cabal: Dependency of ``ghc`` library
libraries/unix/unix.cabal: Dependency of ``ghc`` library
libraries/Win32/Win32.cabal: Dependency of ``ghc`` library
libraries/xhtml/xhtml.cabal: Dependency of ``haddock`` executable
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